I joined my creative world thats in 19w39a, and I looked up and saw certain areas of trees where very buggy with their lighting. I recorded it and it is one of the weirdest lighting glitches I've ever seen.
Short clip:
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Environment
Windows 10 64-bit OS, x64-based processor; Intel (R) Core (TM) i5-8250U CPU @ 1.60GHz 1.80GHz
Your video didn't attach, but it sounds like your issue is MC-161877.
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